Stay-bolt structure



E. :l nouns STAYBOLT STRUCTURE Nov'. 27,-.1923 C .1,475,474

Filed Oct. 5, 1922 Patented Nov. 27, 1923.

UNITED STATES 1,475,4r/i rifi'rENr ortica.

ETHAN I. DODDS, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO FLANNERY BOLT COMPANY, 'OF PITTSBURGH, PENNSYLVANIA.

STAYB0`LT STRUCTURE.

Application tiled October 5, 1922. Serial No. 592,545.

T all whom t may concern:

Be it known that I, ETHAN I. DoDDs, a citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have Vinvented certain new and useful Improvements in Stay-Bolt'Structures; and I do hereby declare the following to be a full, clear, and exact description of the invention, ksuch as will enable others skilled in theart to which 'it appertains to make and use the same.

This invention relates to improvements in staybolt structures for boilers,one object of the invention being to so construct devices of this character in which the staybolt comprises two connected members, that one of said members shall be tubular in form and have universally movable mounting at one end in the wall of the outer boiler sheet and universally movable connection at its other end with the other member of the bolt, and to provide simple and eicient closure means which shall be so constructed as to permit access to the interior of the tubular member for inspection purposes and to permit manipulation of the other bolt member.

With this and other objects in view, the invention consists in certain novel features of construction and combinations of parts as hereinafter set forth and pointed out in the claims.

In the accompanying drawings,-

Figure 1 is a sectional view partly in elevation of a staybolt structure embodying my improvements, and

Figures 2, 3, 4 and 5 are views illustrating modifications.

An outer boiler sheet is shown at 1 and an inner sheet at 2, the latter having a threaded hole through which the threaded portion 3 of a staybolt member 4 passes and is upset as indicated at 5. The staybo-lt member 4 is comparatively short and is provided with a spherical or otherwise rounded head 6 and preferably also with a tell-tale hole 7.

The outer boiler sheet l is provided with a hole or opening 8, a portion 9 of the wall of which is curved transversely and a portion 10 is made flaring. A tubular staybolt member 11 receives at its inner end portion a head 6 of the staybolt member 4 and is provided with a curvedseat 12 on whichA said head has a bearing so that the staybolt member 11 may have universal movement Arelatively to the head Got the fixed staybolt ll. From the above description, it will be apparent that the tubular staybolt member 11 has universally movable connection at one endv with the boiler sheet and at the other end with the fixed staybolt member 4. A closure disk 15 is inserted into the outer portion of the openin 8 in the outer boiler sheet and is made wit a peripheral beveled portion 16 which engages thev wall oit the opening 8 at the juncture ofthe portions 9 and l0 of said wall, thus forming with the portion 10, a V-shaped groove in which a weld 17 is located. The disk 15 is provided centrally with an internally threaded .boss 18`which. may enter thevopen outer end portion of the tubular staybolt member 11 and this boss receives an externally threaded, removable closure 19.

In the construction shown in Figure 2 the closure means comprises a ring or sleeve 20 entering the opening in the boiler sheet` and having a shoulder 21 resting on the outer face of the boiler sheet, and said ring or sleeve is welded to the boiler sheet asindicated at 22. The ring or sleeve 20 is threaded interiorly as at 23 and is provided also with an internal shoulder 24. An externally threaded closure 25 is screwed'into the ring or sleeve 20 and may be provided with a shoulder 26 o-ver the shoulder 24 in said ring or sleeve.

In the construction shown in Figure 3 the outer boiler sheet 1tL is provided with an opening 27 having the outer end portion of its wall rounded as shown at 28 to form a seat for the rounded portion of the enlargement 29 on the tubular staybolt member 11. A sleeve or housing 30 is mounted on the outer boiler sheet so as to surround the opening in the latter'and is welded to said boiler sheet as indicated at 31. Said sleeve or hous ing is internally thread-ed to receive an externally threaded closure member 32.

In the construction shown in Figures 4 and 5, the externally curved head or enlarge-l ment 33 on the tubular member 11 of ythe staybolt is made sufliciently large to extend beyond the outer face of the boiler sheet closure is provided for the open endiof ther tubular bolt member ll.

YWith my improvements,-the tubular member not only has universally movabl'e'connection with the outer boiler sheet and vvith the Vfixed bolt member, but accessmay be readily had to the interior of the tubular bolt member :t'or inspection purposes and also for the insertion ot' a tool Wherevvith to manipulate the bolt member 4,-the lat ter being provided with a korf 40 to receive such tool.

Having fully described my invention what l claim as new and desire to secure by Letters-Patent, is:

l. In a staybolt structure, the combination .of a staybolt comprising a tubular member open at one end and having a rounded head at its open end and a member provided with a rounded heady at one end meunted in Yone end of said tubular member and having a threaded portion at its other end, and removable closure means for the outer end of the tubular bolt member. y

2. ln a staybolt structure, the combinan tion with an outer boiler sheet having an opening provided with a transversely curved Wall portion, and an inner boiler sheet, oi a bolt member secured to said inner boiler sheet and provided With a rounded head, a tubular bolt member receiving said rounded head and having a bearing Within the same for said head, said tubular bolt member having a head at its outer end pro-` ,stayboltw member receiving said rounded headv and having a bearing therefor at'its inner end portion, thev outer end portion ot the tubular bolt member being open and provided vvith a head having a rounded portion engaging the rounded Wall portion vof the opening inl the outer boiler sheet, a disk Welded in the opening of the outer, boiler sheet and having an internally threaded boss entering the; open end of the tubularbolt member, and an externally threaded closure entering said boss. Y i

4. ln a staybolt structure, the combination with an outer boiler sheet having an opening, and an inner boiler sheet, of a staybolt comprising a tubular member open at its outer end and having a part mounted on the wall of the openingv in the outer boiler sheet and a member having` a rounded head mounted in the inner end of said tubular member and' rigidly secured to the inner boiler sheet, and closure means over the open outer end of the tubular bolt memberv and connected with the outer boiler sheet.

.ln testimony whereof, I have signed this specification. 

